[Bug target/49833] [x32] PIC doesn't work

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49833

--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> 2011-07-25 16:41:36 UTC ---
(In reply to comment #7)
> (In reply to comment #1)
> > X32 dynamic linker is miscompiled:
> 
> BTW: These two functions look the same to me.
> 
> "lea    (%rsi,%rdx,1),%edx" is the same as "add    %esi,%edx".
> 
> Can you please post the values of %rsi and %rdx before the insn and %rdx and
> %r13d after the insn?
> 
> The %rdx value you posted was from "mov    -0xc(%rdx),%edx"

Working ld.so sets EDX properly with:

   0x0011470a <+922>:    lea    (%rdx,%rdx,2),%edx
   0x0011470d <+925>:    lea    (%rcx,%rdx,4),%eax
   0x00114710 <+928>:    cmp    %eax,%ecx
   0x00114712 <+930>:    mov    %eax,%ebx
   0x00114714 <+932>:    jae    0x11475b <_dl_start+1003>
   0x00114716 <+934>:    cmpb   $0x8,0x4(%r8)
   0x0011471b <+939>:    mov    (%r8),%edx

Bad ld.so sets EDX with

   0x001147ca <+922>:    lea    (%rdx,%rdx,2),%eax
   0x001147cd <+925>:    lea    (%rcx,%rax,4),%eax
   0x001147d0 <+928>:    cmp    %eax,%ecx
   0x001147d2 <+930>:    mov    %eax,%ebx
   0x001147d4 <+932>:    jae    0x11481c <_dl_start+1004>
   0x001147d6 <+934>:    cmpb   $0x8,0x4(%r8)
   0x001147db <+939>:    mov    (%r8),%eax
   0x001147de <+942>:    jne    0x1148f1 <_dl_start+1217>
   0x001147e4 <+948>:    lea    0xc(%r8),%esi
   0x001147e8 <+952>:    lea    0x0(%r13,%rax,1),%edx